I have caller ID where I am now, mainly because I carried it over from my previous number when I lived in another state. I had it there largely because of the enormous number of telephone solicitors who called me. I would get home from work around 6:00 p.m., and it was not unusual to have 6 or 7 solicitors call before I went to bed. Of course, caller ID didn't prevent the calls, so I took another tack, answering the calls and firmly telling the solicitors to take me off their calling list. That seemed to work, because the number of calls dropped greatly once I did that.
Caller ID was also helpful whili I was going through my divorce; there were times I didn't feel like talking with certain people.
It's also helpful because it shows you a list of whoever called while you were away, even if they didn't leave a message.
And, I understand that some here have used it as a way of avoiding unwanted contact from JW elders who were harassing them.
So, I do think caller ID has its place as a tool in these days of modern times.
Tom
"The truth was obscure, too profound and too pure; to live it you had to explode." ---Bob Dylan